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Routing TCP/IP, Volume I (CCIE Professional Development) by Jeff Doyle

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Troubleshooting RIPv2

Two configuration problems common to RIPv2 are mismatched versions and misconfigured authentication. Both difficulties are easy to discover with debugging, as Figure 7.19 shows.

Figure 7.19. Debugging reveals mismatched versions and misconfigured authentication.

A more likely source of trouble with RIPv2, or any classless routing protocol, is a misconfigured variable-length subnet mask. VLSM is not difficult, but if a VLSM scheme is not designed and managed carefully it can cause some unusual routing difficulties.

Case Study: Misconfigured VLSM

Host C in Figure 7.20 cannot communicate across the internetwork, ...

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